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2. Magnetometer - Wikipedia

   en.wikipedia.org/wiki/Magnetometer

   Magnetic fields are vector quantities characterized by both strength and direction. The strength of a magnetic field is measured in units of tesla in the SI units, and in gauss in the cgs system of units. 10,000 gauss are equal to one tesla. [1] Measurements of the Earth's magnetic field are often quoted in units of nanotesla (nT), also called ...

3. Gauge block - Wikipedia

   en.wikipedia.org/wiki/Gauge_block

   Metric gauge block set, 112 pcs Another set with 8 pcs, 125 mm - 500 mm Trolley model. Gauge blocks (also known as gage blocks, Johansson gauges, slip gauges, or Jo blocks) are a system for producing precision lengths. The individual gauge block is a metal or ceramic block that has been precision ground and lapped to a specific thickness. Gauge ...

4. List of measuring instruments - Wikipedia

   en.wikipedia.org/wiki/List_of_measuring_instruments

   Luminance meter for measuring luminance, i.e. luminous flux per unit area and unit solid angle Light meter , an instrument used to set photographic exposures . It can be either a lux meter (incident-light meter) or a luminance meter (reflected-light meter), and is calibrated in photographic units.

5. Magnetic declination - Wikipedia

   en.wikipedia.org/wiki/Magnetic_declination

   Somewhat more formally, Bowditch defines variation as "the angle between the magnetic and geographic meridians at any place, expressed in degrees and minutes east or west to indicate the direction of magnetic north from true north. The angle between magnetic and grid meridians is called grid magnetic angle, grid variation, or grivation." [1]

6. Magnetic vector potential - Wikipedia

   en.wikipedia.org/wiki/Magnetic_vector_potential

   In the Coulomb gauge =, there is a formal analogy between the relationship between the vector potential and the magnetic field to Ampere's law =. Thus, when finding the vector potential of a given magnetic field, one can use the same methods one uses when finding the magnetic field given a current distribution.

7. Introduction to gauge theory - Wikipedia

   en.wikipedia.org/wiki/Introduction_to_gauge_theory

   A gauge theory is a type of theory in physics.The word gauge means a measurement, a thickness, an in-between distance (as in railroad tracks), or a resulting number of units per certain parameter (a number of loops in an inch of fabric or a number of lead balls in a pound of ammunition). [1]